DOLAN SPRINGS - Mohave County Sheriff's deputies stopped another speeding tour bus at around 5 p.m. on Friday, April 25, on Pierce Ferry Road. Li Chao Yu, 49, of Corona, Calf., was driving a tour bus for Asiana Superior Coach and was en route back to Las Vegas from Grand Canyon West when he was stopped for driving 55 miles per hour in a 25 mph zone. Once the deputy stopped the bus, he found that Yu was driving the bus in violation of a restriction on his California driver's license. According to his license, he was not allowed to drive a vehicle with airbrakes. He was issued a citation for a criminal speeding violation and for violating the restriction on his license. The bus, with its 40 passengers, was placed out of service until 9:30 p.m. when another driver with the appropriate license arrived.